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US3930124A - PCM time-division multiplex telecommunication network - Google Patents

PCM time-division multiplex telecommunication network Download PDF

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Publication number
US3930124A
US3930124A US483021A US48302174A US3930124A US 3930124 A US3930124 A US 3930124A US 483021 A US483021 A US 483021A US 48302174 A US48302174 A US 48302174A US 3930124 A US3930124 A US 3930124A
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US
United States
Prior art keywords
pcm
systems
division multiplex
time
networks
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Expired - Lifetime
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US483021A
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English (en)
Inventor
Karl-Anton Lutz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
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Publication of US3930124A publication Critical patent/US3930124A/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/047—Distributors with transistors or integrated circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Definitions

  • PCM pulse code modulated
  • the invention relates to a PCM time-division multiplex telecommunication network having a plurality of PCM time-division multiplex central offices interconnected via time-division multiplex lines.
  • PCM superordinate systems are constructed by interleaving, on a time-division basis, time periods pertaining to PCM basic systems.
  • data are transmitted for which all the time periods of a PCM basic system or PCM superordinate system are used for the formation of a single transmission channel.
  • the PCM time-division telecommunication network is characterized in that in the individual time-division multiplex central offices the through-connecting devices for connecting incoming time-division multiplex lines to outgoing time-division multiplex lines each have a time-division multiplex switching network and at least one pair of space-division multiplex switching networks.
  • the parts of the system disposed at the receiver and transmitter of the time-division multiplex switching network, through the connection of outputs of the receiver to inputs of the transmitter are directly connected to one another.
  • the inputs of the receiver parts of the pairs of spacedivision multiplex networks are connected to the outputs of demultiplexers for the uninterleaving of higher order PCM systems into PCM systems of the next lower order and/or to time-division multiplex interchange trunks for PCM systems of the latter order.
  • the outputs of the transmitting parts of the space-division multiplex switching networks are connected to the inputs of multiplexcrs for the interleaving of lower order PCM systems into PCM systems of the next higher order and/or to time-division multiplex lines for PCM systems of the higher order.
  • the outputs of the receiver parts of the pairs of space-division multiplex switching networks, not serving for the direct connection with the other part of the pair, insofar as it concerns the part of a pair of space-division multiplex switching networks for the through-connection of PCM basic systems, are connected to the inputs of the time-division multiplex switching network. Insofar as it concerns the parts of pairs of space-division multiplex switching networks for the through-connection of higher order PCM systems they are connected to the inputs of the corresponding multiplexers.
  • the drawing shows a through-connecting unit constructed according to the invention for connecting incoming time-division multiplex lines to outgoing time-division multiplex lines.
  • This unit is in the form as it is found in the individual time-division multiplex central offices of a PCM time-division multiplex telecommunication network.
  • the through-connecting unit has a time-division multiplex switching network ZK containing a number of crosspoint contacts operated according to the timedivision multiplex principle, as well as a number of storages which are each capable of storing all the information bits occurring within the pulse frame of a PCM basic system and through appropriate control of the writing or readout serve to convert time slots.
  • the time-division multiplex switching network may, for example, be constructed as the one described in Austrian Pat. No. 3,395,254.
  • the through-connecting unit shown in the drawing also has pairs of space-division multiplex networks RA, RA and RB, RB, whose sections are located on the receive or send side of the time-division multiplex switching network.
  • the pairs of space-division multiplex switching networks are assigned to PCM systems of different orders, i.e., the space-division multiplex switching networks RA and RA to PCM basic systems,
  • the number of all the pairs of space-division multiplex switching networks available in a throughconnecting unit depends on the order of PCM systems, among which are, moreover, systems that are occupied for the transmission of a single information channel. In the present example, it is assumed that 8.448 Mbits per second will be necessary for the information to be transmitted at the highest bit rate, i.e., second order PCM systems still require whole systems for transmitting the information. Accordingly, a pair of space-division multiplex switching networks are required for second order PCM systems.
  • section RA of the first pair of spacedivision multiplex switching networks are connected over links LLA to individual inputs of the other section RA.
  • the remaining outputs of section RA are in communication with the inputs of the time-division multiplex switching network ZK; the remaining inputs of section RA are connected to the outputs of the time-division multiplex switching network ZK.
  • the inputs of section RA of the first pair of spacedivision multiplex switching networks are connected to the outputs of demultiplexers D2/1 and to incoming time-division multiplex lines Lkl.
  • the demultiplexers D2/l serve to uniterleave second order PCM systems into first order PCM systems.
  • the outputs of section RA are each partly connected to an input of multiplexers Ml/2, partly to outgoing time-division multiplex lines Lg over which information pertaining to PCM basic systems is transmitted.
  • the multiplexers Ml/2 serve to interleave PCM basic systems into second order PCM systems.
  • section RB of the second pair of space-division multiplex switching networks are each connected directly to another input of the other section RB of the pair over links LLB.'The remaining outputs of the receiver section RB of the pair of spacedivision multiplex switching networks are each connected to the input of another one of the demultiplexers D2/l. The remaining inputs of the transmitter section RB are each connected to the input of another multiplexer M 1/2.
  • the inputs of section RN of the second pair of spacedivi sion multiplex switching networks are connected to the outputs of demultiplexers D3/2 or to incoming time-division multiplex lines Lk2.
  • the demultiplexers 3/2 serve to uninterleave third order PCM systems into second order PCM systems; the time-division multiplex lines Lk2 serve to transmit information pertaining to second order PCM systems.
  • the outputs of section RB of the transmitter section RBI of the second pair of space-division multiplex switching networks are each connected to another input of the multiplexers M2/3 or to outgoing time-division multiplex lines Lg2.
  • the multiplexers M2/3 serve to interleave second order PCM systems into third order PCM systems; the timedivision multiplex lines Lg2 serve to transmit information pertaining to second order PCM systems.
  • Dcmultiplexers and multiplexers may, for example, be constructed in the manner described in Review of the Electrical Communication Laboratories I7 (1969), Nos. 5 and 6, pp. 362-375.
  • space division multiplex switching networks they travel either to the inputs of the multiplexers M2/3, which they again interleave together with other second order PCM systems into third order PCM systems, or to timedivision multiplex lines LgZ carrying second order PCM systems.
  • the remaining second order PCM systems are switched through by the receiver portion RB of the second pair of space-division multiplex switching networks to the inputs of demultiplexers D2/l which uninterleave the same into four PCM basic systems each.
  • the PCM basic systems are routed to the receiver section RA of the first pair of space-division multiplex switching networks together with further PCM basic systems coming in on the time-division multiplex lines Lkl.
  • Information requiring a whole PCM basic system for a transmission channel, e.g., rapid data, is switched through by the section RA of the pair of space-division multiplex switching networks to the links LLA.
  • the information travels from there to the transmitter section RA of the pair of space-division multiplex switching networks, by which they are switched through either to the inputs of the multiplexers Ml/2 or to outgoing time-division multiplex lines Lgl.
  • the multiplexers M 1/2 again interleave fo'ur PCM basic systems at a time into a second order PCM system, transferring the same to the transmitter section RB of the second pair of space-division multiplex switching networks over which, as explained hereinabove, they travel either to the inputs of the multiplexers M2/3 or to outgoing time-division multiplex lines Lg2.
  • the remaining PCM basic systems are switched through by the receiver portion RA of the first pair of space-division multiplex switching networks to the inputs of the time-division multiplex switching network Zk. After being switched in accordance with the timedivision multiplex principle, they travel to one of the outputs of the time-division multiplex switching net work and from there to inputs of the transmitter portion RA of the first pair of space-division multiplex switching networks. From there they follow the same path as the PCM basic systems routed directly to the switching network portion RA. Thus, they travel either to outgoing time-division multiplex lines Lgl or Lg2 or Lg3.
  • a PCM time division multiplex telecommunication network having a plurality of PCM time division multiplex central offices interconnected by means of time division multiplex lines, wherein on at least one part of the time division multiplex lines PCM superordinate systems are constituted by interleaving, on a time division basis, time periods pertaining to PCM basic systems, and wherein data are transmitted for which all the time periods of a PCM basic system or PCM superordinate system are used for the formation of a single transmission channel, the improvement comprising:
  • a time division multiplex switching network and at least one pair of space division multiplex switching networks in each central office said space division networks having corresponding parts on the receive side of said time division network connected to corresponding send side parts through the connection of outputs of the receive side with inputs of the send side,
  • demultiplexer means fo uninterleaving higher order PCM systems into PCM systems of the next lower order having outputs connected to inputs of receive side parts of the pair of space division multiplex networks, said receive side inputs being connected also to interexchange trunks,
  • multiplexers for interleaving lower order PCM systems into PCM systems of the next higher order having inputs connected to outputs of send side parts of the space division multiplex networks, said send side outputs being connected also to time division multiplex lines for PCM systemsof a higher order,

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
US483021A 1973-06-29 1974-06-25 PCM time-division multiplex telecommunication network Expired - Lifetime US3930124A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2333254A DE2333254C2 (de) 1973-06-29 1973-06-29 PCM-Zeitmultiplexfernmeldenetz

Publications (1)

Publication Number Publication Date
US3930124A true US3930124A (en) 1975-12-30

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ID=5885535

Family Applications (1)

Application Number Title Priority Date Filing Date
US483021A Expired - Lifetime US3930124A (en) 1973-06-29 1974-06-25 PCM time-division multiplex telecommunication network

Country Status (13)

Country Link
US (1) US3930124A (de)
JP (1) JPS5330604B2 (de)
AT (1) AT332459B (de)
BE (1) BE817044A (de)
CH (1) CH577775A5 (de)
DE (1) DE2333254C2 (de)
DK (1) DK344574A (de)
FR (1) FR2235564B1 (de)
GB (1) GB1466911A (de)
IT (1) IT1015493B (de)
LU (1) LU70423A1 (de)
NL (1) NL7407735A (de)
SE (1) SE391434B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179587A (en) * 1977-06-20 1979-12-18 L. M. Ericsson Pty. Ltd. Bit switching of word formatted data
US6842422B1 (en) * 1999-06-15 2005-01-11 Marconi Communications, Inc. Data striping based switching system
US6906999B1 (en) 2000-06-30 2005-06-14 Marconi Intellectual Property (Ringfence), Inc. Receiver decoding algorithm to allow hitless N+1 redundancy in a switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3109767C2 (de) * 1981-03-13 1983-05-11 Siemens AG, 1000 Berlin und 8000 München Zeitmultiplexkoppelfeldeinheit zur Zeit-Raum-Vermittlung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794768A (en) * 1972-05-25 1974-02-26 Bell Telephone Labor Inc Cross-office connecting scheme for interconnecting multiplexers and central office terminals

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3794768A (en) * 1972-05-25 1974-02-26 Bell Telephone Labor Inc Cross-office connecting scheme for interconnecting multiplexers and central office terminals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179587A (en) * 1977-06-20 1979-12-18 L. M. Ericsson Pty. Ltd. Bit switching of word formatted data
US6842422B1 (en) * 1999-06-15 2005-01-11 Marconi Communications, Inc. Data striping based switching system
US6906999B1 (en) 2000-06-30 2005-06-14 Marconi Intellectual Property (Ringfence), Inc. Receiver decoding algorithm to allow hitless N+1 redundancy in a switch

Also Published As

Publication number Publication date
SE7408677L (de) 1974-12-30
LU70423A1 (de) 1974-10-17
GB1466911A (en) 1977-03-09
FR2235564A1 (de) 1975-01-24
BE817044A (fr) 1974-12-30
NL7407735A (de) 1974-12-31
CH577775A5 (de) 1976-07-15
ATA389874A (de) 1976-01-15
AT332459B (de) 1976-09-27
DE2333254C2 (de) 1975-04-24
IT1015493B (it) 1977-05-10
JPS5330604B2 (de) 1978-08-28
DE2333254B1 (de) 1974-09-05
JPS5039006A (de) 1975-04-10
SE391434B (sv) 1977-02-14
DK344574A (de) 1975-02-10
FR2235564B1 (de) 1978-12-29

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